We've reached day eleven of the OnSoftware advent calendar. This means it's exactly two weeks until the big day! Have a peak inside today's window - but not until you've had a guess at what Mac app Nick is talking about.

The Twitter client wars are going into overdrive at the moment and I received a tip-off about this one from actor Stephen Fry. If a prolific tweeter like him rates it, then it must be good. Overall Tweetie is, by some margin, the best Twitter client I've ever used. The best thing I've tried on the Mac this year since Spotify - Nick